Sulfur dyestuff



uurrsn WAZFJENT ent ies;

IMAINCHESTEH, LMICftS'lER, IEIQI'GLANID.

N0 Drawing.

To (ZZZ whom it may concern:

.Be it known that 1, MAX WYLER, a citizen of the Confederation ofSwitzerleninnd a;

resident of Manchester, in the county of Lancaster, England, haveinvented a certain new Sulfur Dyestufi, of which thefollowing is aspecification. 1 V

It has been shown (see Bem'chto, vol. 36, page 962 and vol. 36, page.1583) that by the action of sulfur on acenaphthene two products areobtained: dinaphthylenethio heme and trinaphthylenebenzene. We haveiound that by heating sulfur and acenaphthene in different proportionsat new product is formed, which is soluble in sodium sulfid and which iscapable of dyeing cotton from its sulfid solution in'recldish brownshades of extraordinary fastness to washing end orin..

.Ehe following example will serve as an illustration how to obtain thenew and yeluable dye 1 part of acenaphthene is mixed with 31} parts ofsulfur and the mixture is heated at from 250300 U. till the melt becomesthick and soluble in sodium sulfid', which requires about 24 hours. Themelt is powdered, dissolved in a boiling 10% solution of sodium sulfidand filtered if necessary and the dye stuff is precipitated from itssolution hyf hydrochloric acid. It is then collecte filter washedanddried.

We do not confine ourselves to the part1cudon a lars described in ourexample, which may be varied withoutaltering the character of theinvention.

W hat I claim as my invention and desireto secure by Letters Patentis 1. The process for the production oi a new sulfur dyestufii, whichprocess consists Specification of Letters Patent.

retention. new, e, teen.

Application filed IhIerchfiV, 1919. Serial Ellfhllll.

in heating one part of ecen'aphthene with Parts of sulfur at from 250 C.to 300 C. until the melt becomes thick and soluble in sodium sulfid,then powdering the melt, dis.

soluing same in a hoiling 10% solution of sodlum sulfid, filtering thesolution" if necessary, and precip tating the dyestufi therefrom.

-new sulfur dyestufi', which process coniprises heating acenaphthene andsulfur in proportions of approximately 1 to 1} respcc" tively,powdering: the product and dissolving the same in a boiling 10%solutionoi sodium sulfic'l.

5. The process for the production of a new sulfur dyestufi, Whichprocess corn prises heating acenaphthene and Eur in,

proportions of approximately 1 to respectively, powdering the product,dissolv ing the same in a boiling 10% solution of sodium sulfid, andthen precipitating the dyestufl? from the solution with hydrochloricacid.

In witness whereof I have hereunto set my hand.

